0,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

D. A. Klarner, The number of graded partially ordered sets, J. Combin. Theory, 6 (1969), 12-19.

Index entries for sequences related to posets

Sequence in context: A111532 A061634 A049402 this_sequence A048287 A145507 A047685

Adjacent sequences: A001827 A001828 A001829 this_sequence A001831 A001832 A001833

nonn

N. J. A. Sloane (njas(AT)research.att.com).